Mail Server Example

Mail Server Example Mail Server â€" Essay Example > The Internet Message Access Protocol, Version 4 (IMAP4) and Post Office Protocol, Version 3 (POP3), are open Internet standards for retrieving mail from a server. WithIMAP4 and POP3, any messaging client software can connect with any messagingserver. These standards are independent of client and server platforms andoperating systems. For example, UNIX client can receive mail from a Macintoshclient through a Windows NT-based messaging server. When a POP3 client accesses the messaging server, the messages are downloadedfrom the server to the client machine. This essentially splits the message storebetween the server and client. This minimizes connection time, but limits mailaccessibility to one client machine where the messages are stored after beingdownloaded. IMAP4 provides an alternative to POP3 by storing messages and folders on theserver where they can be accessed from any machine using an IMAP4-compliantclient. The user has complete control over managing and organizing the mes sageson the server. With POP3, users can keep messages on the server, but they cannotmanage or organize them on the server. IMAP4 users also have the option ofdownloading folders to their machines so they can view messages offline. If theydelete or move messages while offline, the changes are synchronized with theserver when they reconnect. Mail Server System OverviewMail Server has three main components that you can put together in almost anyconfiguration to design your system. These components are: Nodes A node is a unit of mail Server installation that includes amessaging store database instance and server processes. You can choose to have one or more nodes, depending on how manyusers you must support and the physical locations of thoseusers. Multiple nodes generally exist on separate hostmachines, although they can be installed on the same host. Domains A domain is a logical grouping of directory information, suchas users, with centralized administrative access through aconfig uration node. Domains define how directoryinformation is made available to nodes. You can also usedomains to support multiple Internet domain names, such asacme. com and acme-pro. com. If you only have one node, youcan choose to have only one domain, or you can set upmultiple domains on the node. If you have multiple nodes, you can have one or more domains that include one or moreNodes. Communities A community is a physical grouping of nodes where a directSQLnet connection is available between every pair of nodes. Communities define how nodes communicate with each otherthrough networking protocols like TCP/IP. If you only haveone node, you will only have one community. If you havemultiple nodes, you only need one community unless theyuse different networking protocols. Server Processes Handle Messages in the SystemMail Server uses the following types of processes: n Messaging server processes which perform the basic Email Server functions. n Protocol server processes which route me ssages to clients using the specifiedprotocol(s). n LDAP server processes which handle the synchronization of data between the